Look at MS Office Home/Student Edition it is $135 -- can test out with a free trial

Another alternative is Apple's iWork for $99 -- can test out with a free trial

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Or a freeOffice variant like NeoOffice -- it is free if you are cheap or beerware cost

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You should get a copy of iWork and MS Office trials to see which one will work best ... iWork isn't too bad, but you will need to learn to export the files when sending them to Windows users either as a pdf or word file.